Marc Andreessen

The graphical web browser. Andreessen, as a student at the University of Illinois's NCSA, co-wrote Mosaic with Eric Bina in 1993, which showed images alongside text and ran easily on ordinary computers, making Tim Berners-Lee's web approachable. In 1994 he co-founded Netscape with Jim Clark, whose Navigator brought the web to millions before Microsoft's bundled Internet Explorer overwhelmed it. He later became a prominent venture investor.